During hormone increases you usually get sore swollen breasts, but it should settle down after a few weeks. Perhaps consider dropping your dose, not sure how much you're taking. Are you taking progesterone as well? I remember in peri my boobs went up a cup size, then eventually dropped 2 cup sizes once I was in post. With any new HRT, side effects should settle down in the first month and then it can take 3 months to work on your symptoms. It can be quite a difficult ride finding the right balance. Don't give up just yet.